A scheme for multipartite entanglement distribution via separable carriers

TL;DR

This paper presents a versatile protocol for distributing multipartite entanglement across quantum networks using carriers that remain separable, enhancing the reliability and flexibility of quantum communication.

Contribution

It introduces a novel strategy for entanglement distribution that applies to any network size and pattern, with the carrier always remaining separable from the network.

Findings

Achieves multipartite entanglement with separable carriers

Applicable to various network configurations

Provides a basis for experimental implementation

Abstract

The ability to reliably distribute entanglement among the nodes of a network is an essential requirement for the development of effective quantum communication protocols and the realization of useful quantum networks. It has been demonstrated, in different contexts, that two remote systems can be entangled via local interactions with a carrier system that always remains in a separable state with respect to such distant particles. We develop a strategy for entanglement distribution via separable carriers that can be applied to any number of network nodes to achieve various entanglement distribution patterns. We show that our protocol results in multipartite entanglement, while the carrier mediating the process is always in a separable state with respect to the network. We provide examples showcasing the flexibility of our approach and propose a scheme of principle for the experimental demonstration of the protocol.